A Critical Evaluation of Single Extractions from the SMT Program to Determine Trace Element Mobility in Sediments

Table 5

Average, standard deviation, median, minimum, and maximum of the amounts of major and trace metals extracted with acetic acid and ammonium-EDTA.

Acetic acid
	Cr	Cu	Zn	Ni	As	Cd	Pb	Co	Mn	K	Fe	Ca	Al	pH
	mg/kg	mg/kg	mg/kg	mg/kg	mg/kg	mg/kg	mg/kg	mg/kg	mg/kg	mg/kg	mg/kg	mg/kg	mg/kg
Average	2	10.4	436	8.02	3.26	8	5	1.3	104	338	1049	11386	172	3.1
Stdv	2	15.3	652	8.81	5.60	13	11	1.2	121	786	2223	8865	126	0.4
Median	1	3.3	197	6.34	1.49	5	1	1.1	74	195	296	7846	145	3.1
Min	<0.01	<0.01	4	<0.01	0.05	0.1	<0.01	0.1	2	65	47	1126	28	2.2
Max	10	77.0	3574	43.88	26.96	69	65	4.8	592	6788	13143	38694	844	3.6
Ammonium-EDTA
	Cr	Cu	Zn	Ni	As	Cd	Pb	Co	Mn	K	Fe	Ca	Al	pH
	mg/kg	mg/kg	mg/kg	mg/kg	mg/kg	mg/kg	mg/kg	mg/kg	mg/kg	mg/kg	mg/kg	mg/kg	mg/kg
Average	1	31	419	7.76	2.4	10	49	0.7	50	228	3176	9066	68	6.3
Stdv	1	43	578	9.56	3.6	21	81	0.6	66	143	2957	4478	59	1.0
Median	1	20	216	5.65	1.2	5	21	0.5	41	182	2039	9178	50	6.4
Min	<0.01	0.10	2	0.45	0.02	<0.01	<0.01	<0.01	<0.01	51	176	1232	8	4.6
Max	6	177	2539	51.67	16	109	389	3.3	527	603	11902	18718	265	7.8